Using modal expansion (EXPANSION) ============================================= The method of using this option is not very relevant, it is especially useful for validation. It is preferable, if you want to perform a modal expansion, to use the MACRO_EXPANS command directly, or the PROJ_MESU_MODAL, REST_GENE_PHYS and PROJ_CHAMP chain. .. code-block:: text Keywords MESURE and NUME_MODE_MESURE ------------------------------------ ♦ MESURE = measure, An sd_result concept of the mode_meca or dyna_harmo type that contains the modes to be extended on the numerical model. ♦ NUME_MODE_MESURE = L_I, Allows you to select the order numbers of the modes you want to extend. Keyword CALCUL -------------- ♦ CALCUL = calculation, SD_result concept of the mode_meca type that will be the basis for expansion. The choice of the expansion base is important for the quality of results. ♦ NUME_MODE_CALCUL = L_I, Allows you to select the order numbers of the modes you want to use in the expansion base. It is more interesting to keep only the modes that "resemble" the deformations to be extended, the similarity criterion being obtained by calculating MAC. Tags RESOLUTIONetEPS ------------------------- Expansion consists in solving an inverse problem for the determination of generalized coefficients PROJ_MESU_MODAL. Inversion methods and regularization coefficients are detailed in the user documentation for this operator (cf. [:ref:`U4.73.01 `]).